back fire through intake
05-14-2009, 07:35 PM
#1
back fire through intake iv been trying to solve this problem for god knows how long. at first i thought it was just i miss, then i listened real close and found out its actually a backfire through the intake. only under load, at high rpm and its intermittent. it also changes. sometimes its not there, sometimes its barley noticeable, othertimes its so bad i think its gonna give me whiplash. anyone have any itdeas, nothing i do seems to change it at all.
new parts: opti, coil, plugs, icm, lifters, injectors, fuel pressure regulator, walbro 255 w/ hotwire kit.
it was dyno tuned with a bed opti on it and im thinking thats the cause but i dont wanna drop more money on a retune for them to tell me thats not it.
new parts: opti, coil, plugs, icm, lifters, injectors, fuel pressure regulator, walbro 255 w/ hotwire kit.
it was dyno tuned with a bed opti on it and im thinking thats the cause but i dont wanna drop more money on a retune for them to tell me thats not it.
05-15-2009, 09:43 AM
#3
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Was it doing this after you got it back from the dyno tune or did it start shortly after? You listed all the new parts are these all new after the problem started or are they recently installed then this problem occured. Johny five needs more input 
05-15-2009, 06:48 PM
#4
injectors, ls7 lifters, and acdelco fpr wer installed with the cam, everything else was after.
it was barely running before the dyno. i thought the cam was too big to run on the stock tune when we got it tuned but it turned out to be an opti
it was barely running before the dyno. i thought the cam was too big to run on the stock tune when we got it tuned but it turned out to be an opti
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05-17-2009, 03:15 PM
#15
well the plate on top of the tb is leaking. im thinking that MIGHT have something to do with it if it pulls a vacuum there. how do you guys get that thing to seal? the rubber expands when it gets oil on it. do you just use rtv or regular gasket material or what?
05-17-2009, 05:14 PM
#17
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If you unplugged your MAF and there was no difference in driveability, I think something is wrong there. The MAF is important enough that it should run poorly without it hooked up and if it is the same, I think your problem lies there somewhere.
